US3915874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid developer for use in electrophotographic transfer process
Assignee: Ricoh Co Ltd
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Filing: 1973-07-27
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Granted: 1975-10-28
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Expires: 1993-07-27
Abstract
Abstract A liquid developer for use in the electrophotographic transfer process comprising a liquid carrier with an electric resistance of not less than 109 Omega .cm and a dielectric constant not greater than 3, having dispersed therein a toner comprising particles of a colored substance coated with at least one resinous substance which will penetrate cloth or paper, together with fine particles being harder than the toner particles and having an average particle diameter of from 1 to 15 Mu .
Inventors
- 👤 Hazime Machida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:32
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/13; G03G9/131; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/105
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
91 words
A LIQUID DEVELOPMENT FOR USE IN ELECTROPHOTOGRAPHIC TRANSFER PROCESS WHICH COMPRISES: A CARRIER LIQUID HAVING AN ELECTRIC RESISTANCE OF AT LEAST 109*.CM AND A DIELECTRIC CONSTANT UP TO 3 A TONER DISPERSED IN SAID CARRIER LIQUID SAID TONER COMPRISING PARTICLES OF A COLORED SUBSTANCES AND AT LEAST NE RESINOUS SUBSTANCES COATED ON THE SURFACE OF SAID PARTICLES, SAID RESINOUS SUBSTANCE BEING CAPABLE OF PENETRATIONG INTO A PAPER OR A CLOTH TOGETHER WITH FINE INORGANIC PARTICLES BEING HARDER THAN THE TONER PATRICLES AND HAVING AVERAGE PARTICLE DIAMETER RANGING FROM 1 TO 15Y.
Claim 2
Dependent Claim
91 words
A LIQUID DEVELOPMENT FOR USE IN ELECTROPHOTOGRAPHIC TRANSFER PROCESS WHICH COMPRISES: A CARRIER LIQUID HAVING AN ELECTRIC RESISTANCE OF AT LEAST 109*.CM AND A DIELECTRIC CONSTANT UP TO 3 A TONER DISPERSED IN SAID CARRIER LIQUID SAID TONER COMPRISING PARTICLES OF A COLORED SUBSTANCES AND AT LEAST NE RESINOUS SUBSTANCES COATED ON THE SURFACE OF SAID PARTICLES, SAID RESINOUS SUBSTANCE BEING CAPABLE OF PENETRATIONG INTO A PAPER OR A CLOTH TOGETHER WITH FINE INORGANIC PARTICLES BEING HARDER THAN THE TONER PATRICLES AND HAVING AVERAGE PARTICLE DIAMETER RANGING FROM 1 TO 15Y.
Claim 3
Dependent Claim
37 words
A liquid developer according to claim 1, wherein said resinous substance is selected from the following group of butyl rubbers, isobutyl rubbers, chlorinated isobutylene rubbers, modified alkyd resins, isobutylene - butylene copolymers and styrene - butadiene copolymers.
Claim 4
Dependent Claim
25 words
A liquid developer according to claim 1, wherein the fine particles selected from the group consisting of glass beads, zinc oxide, titanium oxide and silica.
Claim 5
Dependent Claim
36 words
A liquid developer according to claim 1, wherein the ratio of resinous substance to particles of colored substance is from 1 -30 parts by weight of the former to 1 part by weight of the latter.
Claim 6
Dependent Claim
27 words
A liquid developer according to claim 1, wherein the ratio of toner to fine particles dispersed in the carrier liquid with said toner is 0.1:1 to 1:1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |